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code.delx.au - gnu-emacs/blob - lib-src/emacsclient.c
1 /* Client process that communicates with GNU Emacs acting as server.
2 Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
7 GNU Emacs is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU Emacs is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU Emacs; see the file COPYING. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
44 char *getenv (), *getwd ();
47 /* This is defined with -D from the compilation command,
48 which extracts it from ../lisp/version.el. */
51 #define VERSION "unspecified"
54 /* Name used to invoke this program. */
57 /* Nonzero means don't wait for a response from Emacs. --no-wait. */
60 /* Nonzero means args are expressions to be evaluated. --eval. */
63 /* The display on which Emacs should work. --display. */
66 /* If non-NULL, the name of an editor to fallback to if the server
67 is not running. --alternate-editor. */
68 const char * alternate_editor
= NULL
;
70 void print_help_and_exit ();
72 struct option longopts
[] =
74 { "no-wait", no_argument
, NULL
, 'n' },
75 { "eval", no_argument
, NULL
, 'e' },
76 { "help", no_argument
, NULL
, 'H' },
77 { "version", no_argument
, NULL
, 'V' },
78 { "alternate-editor", required_argument
, NULL
, 'a' },
79 { "display", required_argument
, NULL
, 'd' },
83 /* Decode the options from argv and argc.
84 The global variable `optind' will say how many arguments we used up. */
87 decode_options (argc
, argv
)
93 int opt
= getopt_long (argc
, argv
,
94 "VHnea:d:", longopts
, 0);
99 alternate_editor
= getenv ("ALTERNATE_EDITOR");
104 /* If getopt returns 0, then it has already processed a
105 long-named option. We should do nothing. */
109 alternate_editor
= optarg
;
125 fprintf (stderr
, "emacsclient %s\n", VERSION
);
131 print_help_and_exit ();
137 print_help_and_exit ()
140 "Usage: %s [OPTIONS] FILE...\n\
141 Tell the Emacs server to visit the specified files.\n\
142 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
143 The following OPTIONS are accepted:\n\
144 -V, --version Just print a version info and return\n\
145 -H, --help Print this usage information message\n\
146 -n, --no-wait Don't wait for the server to return\n\
147 -e, --eval Evaluate the FILE arguments as ELisp expressions\n\
148 -d, --display=DISPLAY Visit the file in the given display\n\
149 -a, --alternate-editor=EDITOR\n\
150 Editor to fallback to if the server is not running\n\
151 Report bugs to bug-gnu-emacs@gnu.org.\n", progname
);
155 /* Return a copy of NAME, inserting a &
156 before each &, each space, each newline, and any initial -.
157 Change spaces to underscores, too, so that the
158 return value never contains a space. */
161 quote_file_name (name
)
164 char *copy
= (char *) malloc (strlen (name
) * 2 + 1);
185 if (*p
== '&' || (*p
== '-' && p
== name
))
195 /* Like malloc but get fatal error if memory is exhausted. */
201 long *result
= (long *) malloc (size
);
211 Try to run a different command, or --if no alternate editor is
212 defined-- exit with an errorcode.
219 if (alternate_editor
)
222 execvp (alternate_editor
, argv
+ i
);
233 #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM)
240 fprintf (stderr
, "%s: Sorry, the Emacs server is supported only\n",
242 fprintf (stderr
, "on systems with Berkeley sockets.\n");
247 #else /* HAVE_SOCKETS */
249 #include <sys/types.h>
250 #include <sys/socket.h>
252 #include <sys/stat.h>
255 extern char *strerror ();
258 /* Three possibilities:
259 2 - can't be `stat'ed (sets errno)
260 1 - isn't owned by us
261 0 - success: none of the above */
264 socket_status (socket_name
)
269 if (stat (socket_name
, &statbfr
) == -1)
272 if (statbfr
.st_uid
!= geteuid ())
284 int system_name_length
;
285 int s
, i
, needlf
= 0;
287 struct sockaddr_un server
;
288 #ifdef SERVER_HOME_DIR
296 /* Process options. */
297 decode_options (argc
, argv
);
299 if (argc
- optind
< 1)
300 print_help_and_exit ();
303 * Open up an AF_UNIX socket in this person's home directory
306 if ((s
= socket (AF_UNIX
, SOCK_STREAM
, 0)) < 0)
308 fprintf (stderr
, "%s: ", argv
[0]);
313 server
.sun_family
= AF_UNIX
;
316 system_name_length
= 32;
320 system_name
= (char *) xmalloc (system_name_length
+ 1);
322 /* system_name must be null-terminated string. */
323 system_name
[system_name_length
] = '\0';
325 if (gethostname (system_name
, system_name_length
) == 0)
329 system_name_length
*= 2;
333 #ifndef SERVER_HOME_DIR
337 sprintf (server
.sun_path
, "/tmp/esrv%d-%s", (int) geteuid (), system_name
);
339 /* See if the socket exists, and if it's owned by us. */
340 sock_status
= socket_status (server
.sun_path
);
343 /* Failing that, see if LOGNAME or USER exist and differ from
344 our euid. If so, look for a socket based on the UID
345 associated with the name. This is reminiscent of the logic
346 that init_editfns uses to set the global Vuser_full_name. */
348 char *user_name
= (char *) getenv ("LOGNAME");
350 user_name
= (char *) getenv ("USER");
354 struct passwd
*pw
= getpwnam (user_name
);
355 if (pw
&& (pw
->pw_uid
!= geteuid ()))
357 /* We're running under su, apparently. */
358 sprintf (server
.sun_path
, "/tmp/esrv%d-%s",
359 (int) pw
->pw_uid
, system_name
);
360 sock_status
= socket_status (server
.sun_path
);
368 /* There's a socket, but it isn't owned by us. This is OK if
372 fprintf (stderr
, "%s: Invalid socket owner\n", argv
[0]);
381 "%s: can't find socket; have you started the server?\n",
384 fprintf (stderr
, "%s: can't stat %s: %s\n",
385 argv
[0], server
.sun_path
, strerror (errno
));
391 if ((homedir
= getenv ("HOME")) == NULL
)
393 fprintf (stderr
, "%s: No home directory\n", argv
[0]);
396 strcpy (server
.sun_path
, homedir
);
397 strcat (server
.sun_path
, "/.emacs-server-");
398 strcat (server
.sun_path
, system_name
);
401 if (connect (s
, (struct sockaddr
*) &server
, strlen (server
.sun_path
) + 2)
404 fprintf (stderr
, "%s: ", argv
[0]);
409 /* We use the stream OUT to send our command to the server. */
410 if ((out
= fdopen (s
, "r+")) == NULL
)
412 fprintf (stderr
, "%s: ", argv
[0]);
417 /* We use the stream IN to read the response.
418 We used to use just one stream for both output and input
419 on the socket, but reversing direction works nonportably:
420 on some systems, the output appears as the first input;
421 on other systems it does not. */
422 if ((in
= fdopen (s
, "r+")) == NULL
)
424 fprintf (stderr
, "%s: ", argv
[0]);
430 cwd
= getwd (string
);
432 cwd
= getcwd (string
, sizeof string
);
436 /* getwd puts message in STRING if it fails. */
437 fprintf (stderr
, "%s: %s (%s)\n", argv
[0],
441 "Cannot get current working directory",
448 fprintf (out
, "-nowait ");
451 fprintf (out
, "-eval ");
454 fprintf (out
, "-display %s ", quote_file_name (display
));
456 for (i
= optind
; i
< argc
; i
++)
459 ; /* Don't prepend any cwd or anything like that. */
460 else if (*argv
[i
] == '+')
462 char *p
= argv
[i
] + 1;
463 while (isdigit ((unsigned char) *p
) || *p
== ':') p
++;
465 fprintf (out
, "%s/", quote_file_name (cwd
));
467 else if (*argv
[i
] != '/')
468 fprintf (out
, "%s/", quote_file_name (cwd
));
470 fprintf (out
, "%s ", quote_file_name (argv
[i
]));
475 /* Maybe wait for an answer. */
481 printf ("Waiting for Emacs...");
486 /* Now, wait for an answer and print any messages. */
487 while ((str
= fgets (string
, BUFSIZ
, in
)))
492 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
502 #endif /* HAVE_SOCKETS */
504 #ifndef HAVE_STRERROR
509 extern char *sys_errlist
[];
512 if (errnum
>= 0 && errnum
< sys_nerr
)
513 return sys_errlist
[errnum
];
514 return (char *) "Unknown error";
517 #endif /* ! HAVE_STRERROR */